here are my 3-5 week old 1st time hydro plants.....ph is around 5.7-6.0, ppm has changed due to over ferting, and starting to add more nutes now due to yellowing. they are in rockwool with hydroton in a pot. i top water and feed maybe every other day so far. bagseed, under cfl's. using floa nova grow and sometimes super thrive. what should i do???????????????